Chimney spark arrester



AprilI 9, 1935.

. 1. sLocUM CHIMNEY SPARK ARRESTER Filed May 17 Inventor j Attorny meneame-9,1935 l 1.1997'5204 'i UNITED STATES# PATENT' oFFlClf-zf -},.1,9 97,2o4 cHiMNEY SPARK ARitnsTER y, James Slocum, Detroit, Mich. ApplicationMay i7, `isaszgserial No. 726,699 n V y2 claims. (c1. iss- 51) My invention relatesto chimney spark ary arc-shapedoverlapping,side walls of the spark 1 resters, shown invthev'acconipanying drawing and arresterwhile providing an unobstructed'circui; l. n more particularly described in the following speci# l tous passage for smoke from A'a normal fire, also cation and claims.' Q "n I L serve tocontroland return to the chimney open- A Vi5 Oneofrthe difficulties confrontingithe'f users Ying dangerous 'sparks and naming embers shot 1 of chimney K spark arresters constructed of open upwardly against the underside of the arc-shaped mesh wire or expandedgsheet metaLis theY partial baille screen 'and overlapping inclined walls vof clogging of the openings with soot therebyLinter-I the'spark arrester when red under the urgeof Y l fering with draft created by winds passing over explosive Vforces resulting f rom abnormal iirejconA thetopofthechimiieyq, f, j ditions. I

This is especially true when'lowgradefbitumi `.Figure 4 is a `horizontal lsectional View Von a nous coal, lignite or soi-called "brown `'or wood relatively smaller scalartaken on or aboutline coal is used, .the smoke'f'cm 'whichfisheavily '4g-4 for Figure `y2,.showingthe arc-shapedfbafiie impregnatedwth carbon and in its upward coursej screen secured to the end walls and spaced from through the chimney, clings to the walls of the the side wallsof the spark arrester to provide 15 chimney and to the wires or structural fabric l`passages for smoke around and above the baille of the spark arrester, thereby shutting off the passcreen. sage of air that would otherwise create a draft Figure 5 is a fragmentary piece of expanded up the chimney. metal, of which the spark arrester and baille- One feature of this invention is a baille screen, screen is preferably constructed. 20 arc-shaped in cross-section, extending the entire Referring now to the letters of reference on length of the chimney opening, with flanges at the drawing for indicatingthe several parts:-

each end by which means the baille is secured di- A denotes a chimney. B the spark arrectly to the contiguous foraminous end walls rester in its entirety, secured by suitable anchorof the spark-arrester. ing means C to the walls of the chimney. j 25` Another object of the invention is to construct The foraminous side walls D, have arc-shaped the device of smooth rust-proof cadmiumized upper portions vbent toward each other, theiry sheet metal, thereby providing a glass-like suropposing endsk being spaced apart to provide a face to which soot is not apt to adhere or fill smoke exit E, extending the entire length ofthe up the openings in the walls. device. A lip or ilange F, projects downwardly 30 With the foregoing and other objects in view from each of the opposing ends of the arc-shaped which will appear as the description proceeds, the portions of the walls D, to assist in preventing invention further resides in the combination and the escape of sparks or burning embers through arrangement of parts and in the details of conthe smoke exit E and to deflect the embers back t struction hereinafter described and claimed, it into the chimney opening. 35

being understood that changes may be ,made in Spaced from the side walls D, and their over-V the precise embodiment of the invention herein lapping top portions is an arc-shaped baftlef disclosed without departing from the spirit of the screen G, having downwardly bent flanges H, at

same. each end whereby the baille screen isrsecured to In the drawing accompanying this specicathe foraminous end walls I, of the device. 40

tion: The spaces J-J, between the baille-screen G Figure 1 isadiagrammatical perspective view of and the foraminous side walls D--D, of the de-` the spark arrester, mounted onrthe top of a Vice provide a circuitous passage for smokeV dischimney. charged through the chimneyopening K, which Figure 2 is a diagrammatic, vertical cross-secextends the full length of the spark arresten- 45 tional view of the structure shown in Figure 1, the cross-sectional area of these passages being p disclosing thearc-shaped baille screen supported approximately equal to or greater than the chimin spaced relationto the overlapping arc-shaped ney opening over which the spark arrester is portion of the side walls of the device, thereby mounted. While these two open passages are providing a circuitous passage through which sufficiently-large to carry all the smoke delivered 50 smoke travels around the baille andout through to and through the arrester, smoke may also the exit gap in the wall overlapping the baillepass through the openings d, in the foraminous screen. l f walls of the device. f

Figure 3 is a similar cross-sectionalview indi- It Awill be noted that the side edges of the baille eating how the arc-shaped baflie screen and the screen,-viewed in cross-section,and spaced as 55 they are from the side walls of the spark arrester, provide on each side of the baIiie-screen an unobstructed passage for smoke between the baffle and the forainincus side walls of the device. It will also be obvious that upwardly bound sparks, resulting from burning soot covering the walls of thechirnney, or aming embers expelled by explosive force through ignition against the underside of the arc-shaped' baiiie-screen, will be deflected by the baie-screen inwardly and downwardly intothechimney opening.

The pair of unobstructed smoke passages that have been provided, have a smoke exit gap or opening E', through the arc-shaped portion-'of`V` the side walls of the baiescreen,-the opposing ends of the overlapping walls beirigben't d0`Wn-" Wardly to provide a pair of deecting v,iianges F, F, which serve to divert sparks or likematter onto'the upper surface of the `arc-shaped bafile'- screen-from which they gravitate into 'thechime ney opening. n I

'The passage-ways J; Jmforsmokabetween the baiielscreen and the outer walls of the spark arrester` are suiciently large to passall ofthe smoke delivered from the chimnf ey,-'in` addition to this there are the pluralityvof small openings or foram'ina'inthe walls ofthe device through which smokemay alsopass.V Y

One purpose of the circuitous course provided for the'passage' of smoke, is to insure against the discharge of chimney sparks of any" perceptible ordangerous size, through the exit gap or opening in the arc-shaped wall'overlapping the baiile-screen;the downwardly bent lips Von each side of said opening serving as a further preventative against the escape of sparks or cinders through the openings.

Having thus described my invention, what I claim is:

1. A spark arrester comprising a foraminous body, adapted to be mounted over the egress openingof a chimney, having unslitted walls extending vertically from the chimney opening, with two of its opposing walls arched at the top toward each other, and spaced medially andv longitudinally the entire length of thebody portion,V for the egress of smoke; and a single unslitted baiiieslcreen extending the length of the spark arrester and securedfto its end walls and spaced from "and concentric with the upper portion of the arched walls, to provide passages of substantially .uniformvcross-.sectional areaextending the en- Ydownwardly-extending anges at their opposing endsgjand an unslitted foraminous baiiie-screen, spagedfrorn, and concentric with the upper arched portion of the' side walls, 'providingv a passage ofv substantially :uniform cross-sectionalarea throughout the passage; and extending the entire vle'ngthoithe body portion.

JAME` s sLocUM. 

